diff --git a/code/nel/include/nel/misc/common.h b/code/nel/include/nel/misc/common.h
index 191db5188..7dc394f24 100644
--- a/code/nel/include/nel/misc/common.h
+++ b/code/nel/include/nel/misc/common.h
@@ -39,7 +39,7 @@
 #endif
 
 #if defined(NL_CPU_INTEL) && defined(NL_COMP_GCC)
-#include "x86intrin.h"
+#include <x86intrin.h>
 #endif
 
 #include "string_common.h"
@@ -69,8 +69,20 @@ namespace	NLMISC
 
 inline uint64 rdtsc()
 {
-	// __rdtsc() is defined under all platforms
+#if defined(NL_COMP_GCC) && !defined(CLANG_VERSION) && (GCC_VERSION <= 40405)
+// for GCC versions that don't implement __rdtsc()
+#ifdef NL_CPU_X86_64
+	uint64 low, high;
+	__asm__ volatile("rdtsc" : "=a" (low), "=d" (high));
+	return low | (high << 32);
+#else
+	uint64 ticks;
+	__asm__ volatile("rdtsc" : "=A" (ticks));
+	return ticks;
+#endif
+#else
 	return uint64(__rdtsc());
+#endif
 }
 
 #endif	// NL_CPU_INTEL
diff --git a/code/nel/include/nel/misc/types_nl.h b/code/nel/include/nel/misc/types_nl.h
index 32b6a85d0..64d82d5bf 100644
--- a/code/nel/include/nel/misc/types_nl.h
+++ b/code/nel/include/nel/misc/types_nl.h
@@ -191,6 +191,10 @@
 #			define NL_ISO_STDTR1_HEADER(header) <header>
 #			define NL_ISO_STDTR1_NAMESPACE std
 #		endif
+#	endif
+	// clang define GCC version for compatibility
+#	ifdef __clang__
+#		define CLANG_VERSION (__clang_major__ * 10000 + __clang_minor__ * 100 + __clang_patchlevel__)
 #	endif
 #endif